Monolithic U-type armature is one of the most important armatures in electromagnetic railgun. First, based on the traditional U-shaped armature, this article proposes a new structural design of the armature with interference at both ends. In addition, based on the calculation results of the interference fit module, a railgun multiphysical field coupling model is established. Second, through the interference fit module, the armature’s equivalent stress and a series of contact characteristics variables of the new armature with different structural parameters are calculated’C and the variation laws of the initial mechanical properties with different structural parameters are acquired. Finally, according to the current transport requirement of 200 kA, short-arm armature 1 and long-arm armature 2 are designed according to the traditional U-shaped armature structure design scheme, and the new armature 3 is designed according to the novel armature structure design scheme. Through the multiphysical field coupling model, the influence of the temperature and thermal stress on the launching performance of the three armatures is obtained. The calculation results show that the thermal stress and temperature will cause a sharp increase in the plastic volume and melting volume of the three armatures and eventually reduce the mechanical properties of the armatures. In addition, thermal stress will cause the contact position of the traditional armatures to move forward, affecting the stability of electromagnetic launching. However, the new armature can always maintain the contact between both ends of the tail and the rail, greatly reducing the influence of thermal stress on the armature launching performance.

中文翻译：

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两端干涉电枢结构设计及其发射性能分析

整体式U型衔铁是电磁轨道炮中最重要的衔铁之一。首先，本文在传统U形衔铁的基础上，提出了一种两端过盈衔铁的新型结构设计。此外，基于过盈配合模块的计算结果，建立了轨道炮多物理场耦合模型。其次，通过过盈配合模块，计算出电枢等效应力和不同结构参数下新型电枢的一系列接触特性变量'C，得到不同结构参数下初始力学性能的变化规律。最后，按照目前 200 kA 的传输要求，短臂电枢1和长臂电枢2按照传统的U形电枢结构设计方案设计，新型电枢3按照新颖的电枢结构设计方案设计。通过多物理场耦合模型，得到温度和热应力对三个电枢发射性能的影响。计算结果表明，热应力和温度会导致三个衔铁的塑性体积和熔化体积急剧增加，最终降低衔铁的力学性能。此外，热应力会导致传统衔铁的接触位置向前移动，影响电磁发射的稳定性。然而，